linux-kernel - Re: [PATCH v4 00/11] KVM: x86: optimize for writing guest page

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Date:	Fri, 04 Nov 2011 17:16:04 +0800
From:	Xiao Guangrong <xiao.grong@...il.com>
To:	Xiao Guangrong <xiaoguangrong@...fujitsu.com>
CC:	Avi Kivity <avi@...hat.com>, Marcelo Tosatti <mtosatti@...hat.com>,
	LKML <linux-kernel@...r.kernel.org>, KVM <kvm@...r.kernel.org>
Subject: Re: [PATCH v4 00/11] KVM: x86: optimize for writing guest page

On 10/11/2011 04:36 PM, Xiao Guangrong wrote:
> On 10/09/2011 09:37 PM, Avi Kivity wrote:
>> On 10/09/2011 02:24 PM, Avi Kivity wrote:
>>> On 10/08/2011 06:06 AM, Xiao Guangrong wrote:
>>>> On 10/07/2011 01:53 AM, Marcelo Tosatti wrote:
>>>>>   On Thu, Sep 22, 2011 at 04:52:40PM +0800, Xiao Guangrong wrote:
>>>>>>   This patchset is against https://github.com/avikivity/kvm.git next branch.
>>>>>>
>>>>>>   In this version, some changes come from Avi's comments:
>>>>>>   - fix instruction retried for nested guest
>>>>>>   - skip write-flooding for the sp whose level is 1
>>>>>>   - rename some functions
>>>>>
>>>>>   Please rebase.
>>>>>
>>>>>
>>>>
>>>> Marcelo,
>>>>
>>>> These patches can be applied without any conflict and it also works well,
>>>> the current code was pulled from https://github.com/avikivity/kvm.git next branch.
>>>>
>>>> What problem did you meet when you applied these? :(
>>>
>>> I guess it was a user error - it applies cleanly here too (and pushed to next, thanks).
>>>
>>
>> However, it seems to reduce performance.
>>
>
> Ouch, will look into it soon.

Hi Avi,

I have done kernbench tests several times on my desktop, but it shows 
very well:

before patchset:
real 212.27
real 213.47
real 204.99
real 200.58
real 199.99
real 199.94
real 201.51
real 199.83
real 198.19
real 205.13

after patchset:
real 199.90
real 201.89
real 194.54
real 188.71
real 185.75
real 187.70
real 188.99
real 188.53
real 186.29
real 188.25

I will test it on our server using kvm-autotest, could you share me your 
config file please?
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